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Chapter 8 Maintenance and Troubleshooting
8-8 PerSeptive Biosystems
8
Flat signal on oscilloscope
or in spectrum window for
sample region (matrix
peaks seen)
(continued)
Accelerating Voltage
too low
Adjust. See Section 5.4.4.2,
Setting Accelerating Voltage.
Sample does not
ionize
Analyze in negative ion mode.
Before mixing with matrix,
chemically derivatize sample
with amino-containing
chemical group.
Use different matrix. See
Section 3.1.1, Selecting a
Matrix.
Sample not
well-dissolved before
applying to sample
plate
Prepare new sample, making
sure sample is well-dissolved,
then apply to sample plate.
Sample and matrix
not well-mixed before
applying to sample
plate
Prepare new sample and
matrix. Mix well before
applying to sample plate.
Sample
concentration too
high or too low
Prepare sample/matrix with a
final sample concentration
appropriate for sample and
matrix. See Section 3.1.3,
Matrix Information.
Dilute or concentrate sample
x 5 and run again.
Table 8-1 Spectrum Troubleshooting (Continued)
Symptom Possible Cause Action
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